<!-- 文件上传，基于 upload-file 和 upload-image 实现 -->
<template>
  <view class="uni-file-picker">
    <view v-if="title" class="uni-file-picker__header">
      <text class="file-title">{{ title }}</text>
      <text class="file-count">{{ filesList.length }}/{{ limitLength }}</text>
    </view>
    <view v-if="subtitle" class="file-subtitle">
      <view>{{ subtitle }}</view>
    </view>
    <upload-image
      v-if="fileMediatype === 'image' && showType === 'grid'"
      :readonly="readonly"
      :image-styles="imageStyles"
      :files-list="url"
      :limit="limitLength"
      :disablePreview="disablePreview"
      :delIcon="delIcon"
      @uploadFiles="uploadFiles"
      @choose="choose"
      @delFile="delFile"
    >
      <slot>
        <view class="is-add">
          <image :src="imgsrc" class="add-icon"></image>
        </view>
      </slot>
    </upload-image>
    <upload-file
      v-if="fileMediatype !== 'image' || showType !== 'grid'"
      :readonly="readonly"
      :list-styles="listStyles"
      :files-list="filesList"
      :showType="showType"
      :delIcon="delIcon"
      @uploadFiles="uploadFiles"
      @choose="choose"
      @delFile="delFile"
    >
      <slot><button type="primary" size="mini">选择文件</button></slot>
    </upload-file>
  </view>
</template>

<script>
  import { chooseAndUploadFile, uploadCloudFiles } from './choose-and-upload-file.js';
  import {
    get_file_ext,
    get_extname,
    get_files_and_is_max,
    get_file_info,
    get_file_data,
  } from './utils.js';
  import uploadImage from './upload-image.vue';
  import uploadFile from './upload-file.vue';
  import sheep from '@/sheep';
  let fileInput = null;
  /**
   * FilePicker 文件选择上传
   * @description 文件选择上传组件，可以选择图片、视频等任意文件并上传到当前绑定的服务空间
   * @tutorial https://ext.dcloud.net.cn/plugin?id=4079
   * @property {Object|Array}	value	组件数据，通常用来回显 ,类型由return-type属性决定
   * @property {String|Array}	url	  url数据
   * @property {Boolean}	disabled = [true|false]	组件禁用
   * 	@value true 	禁用
   * 	@value false 	取消禁用
   * @property {Boolean}	readonly = [true|false]	组件只读，不可选择，不显示进度，不显示删除按钮
   * 	@value true 	只读
   * 	@value false 	取消只读
   * @property {Boolean}	disable-preview = [true|false]	禁用图片预览，仅 mode:grid 时生效
   * 	@value true 	禁用图片预览
   * 	@value false 	取消禁用图片预览
   * @property {Boolean}	del-icon = [true|false]	是否显示删除按钮
   * 	@value true 	显示删除按钮
   * 	@value false 	不显示删除按钮
   * @property {Boolean}	auto-upload = [true|false]	是否自动上传，值为true则只触发@select,可自行上传
   * 	@value true 	自动上传
   * 	@value false 	取消自动上传
   * @property {Number|String}	limit	最大选择个数 ，h5 会自动忽略多选的部分
   * @property {String}	title	组件标题，右侧显示上传计数
   * @property {String}	mode = [list|grid]	选择文件后的文件列表样式
   * 	@value list 	列表显示
   * 	@value grid 	宫格显示
   * @property {String}	file-mediatype = [image|video|all]	选择文件类型
   * 	@value image	只选择图片
   * 	@value video	只选择视频
   * 	@value all		选择所有文件
   * @property {Array}	file-extname	选择文件后缀，根据 file-mediatype 属性而不同
   * @property {Object}	list-style	mode:list 时的样式
   * @property {Object}	image-styles	选择文件后缀，根据 file-mediatype 属性而不同
   * @event {Function} select 	选择文件后触发
   * @event {Function} progress 文件上传时触发
   * @event {Function} success 	上传成功触发
   * @event {Function} fail 		上传失败触发
   * @event {Function} delete 	文件从列表移除时触发
   */
  export default {
    name: 'sUploader',
    components: {
      uploadImage,
      uploadFile,
    },
    options: {
      virtualHost: true,
    },
    emits: ['select', 'success', 'fail', 'progress', 'delete', 'update:modelValue', 'update:url'],
    props: {
      modelValue: {
        type: [Array, Object],
        default() {
          return [];
        },
      },
      url: {
        type: [Array, String],
        default() {
          return [];
        },
      },
      disabled: {
        type: Boolean,
        default: false,
      },
      disablePreview: {
        type: Boolean,
        default: false,
      },
      delIcon: {
        type: Boolean,
        default: true,
      },
      // 自动上传
      autoUpload: {
        type: Boolean,
        default: true,
      },
      // 最大选择个数 ，h5只能限制单选或是多选
      limit: {
        type: [Number, String],
        default: 9,
      },
      // 列表样式 grid | list | list-card
      mode: {
        type: String,
        default: 'grid',
      },
      // 选择文件类型  image/video/all
      fileMediatype: {
        type: String,
        default: 'image',
      },
      // 文件类型筛选
      fileExtname: {
        type: [Array, String],
        default() {
          return [];
        },
      },
      title: {
        type: String,
        default: '',
      },
      listStyles: {
        type: Object,
        default() {
          return {
            // 是否显示边框
            border: true,
            // 是否显示分隔线
            dividline: true,
            // 线条样式
            borderStyle: {},
          };
        },
      },
      imageStyles: {
        type: Object,
        default() {
          return {
            width: 'auto',
            height: 'auto',
          };
        },
      },
      readonly: {
        type: Boolean,
        default: false,
      },
      sizeType: {
        type: Array,
        default() {
          return ['original', 'compressed'];
        },
      },
      driver: {
        type: String,
        default: 'local', // local=本地 | oss | unicloud
      },
      subtitle: {
        type: String,
        default: '',
      },
    },
    data() {
      return {
        files: [],
        localValue: [],
        imgsrc: sheep.$url.static('/static/img/shop/upload-camera.png'),
      };
    },
    watch: {
      modelValue: {
        handler(newVal, oldVal) {
          this.setValue(newVal, oldVal);
        },
        immediate: true,
      },
    },
    computed: {
      returnType() {
        if (this.limit > 1) {
          return 'array';
        }
        return 'object';
      },
      filesList() {
        let files = [];
        this.files.forEach((v) => {
          files.push(v);
        });
        return files;
      },
      showType() {
        if (this.fileMediatype === 'image') {
          return this.mode;
        }
        return 'list';
      },
      limitLength() {
        if (this.returnType === 'object') {
          return 1;
        }
        if (!this.limit) {
          return 1;
        }
        if (this.limit >= 9) {
          return 9;
        }
        return this.limit;
      },
    },
    created() {
      if (this.driver === 'local') {
        uniCloud.chooseAndUploadFile = chooseAndUploadFile;
      }
      this.form = this.getForm('uniForms');
      this.formItem = this.getForm('uniFormsItem');
      if (this.form && this.formItem) {
        if (this.formItem.name) {
          this.rename = this.formItem.name;
          this.form.inputChildrens.push(this);
        }
      }
    },
    methods: {
      /**
       * 公开用户使用，清空文件
       * @param {Object} index
       */
      clearFiles(index) {
        if (index !== 0 && !index) {
          this.files = [];
          this.$nextTick(() => {
            this.setEmit();
          });
        } else {
          this.files.splice(index, 1);
        }
        this.$nextTick(() => {
          this.setEmit();
        });
      },
      /**
       * 公开用户使用，继续上传
       */
      upload() {
        let files = [];
        this.files.forEach((v, index) => {
          if (v.status === 'ready' || v.status === 'error') {
            files.push(Object.assign({}, v));
          }
        });
        return this.uploadFiles(files);
      },
      async setValue(newVal, oldVal) {
        const newData = async (v) => {
          const reg = /cloud:\/\/([\w.]+\/?)\S*/;
          let url = '';
          if (v.fileID) {
            url = v.fileID;
          } else {
            url = v.url;
          }
          if (reg.test(url)) {
            v.fileID = url;
            v.url = await this.getTempFileURL(url);
          }
          if (v.url) v.path = v.url;
          return v;
        };
        if (this.returnType === 'object') {
          if (newVal) {
            await newData(newVal);
          } else {
            newVal = {};
          }
        } else {
          if (!newVal) newVal = [];
          for (let i = 0; i < newVal.length; i++) {
            let v = newVal[i];
            await newData(v);
          }
        }
        this.localValue = newVal;
        if (this.form && this.formItem && !this.is_reset) {
          this.is_reset = false;
          this.formItem.setValue(this.localValue);
        }
        let filesData = Object.keys(newVal).length > 0 ? newVal : [];
        this.files = [].concat(filesData);
      },

      /**
       * 选择文件
       */
      choose() {
        if (this.disabled) return;
        if (
          this.files.length >= Number(this.limitLength) &&
          this.showType !== 'grid' &&
          this.returnType === 'array'
        ) {
          uni.showToast({
            title: `您最多选择 ${this.limitLength} 个文件`,
            icon: 'none',
          });
          return;
        }
        this.chooseFiles();
      },

      /**
       * 选择文件并上传
       */
      chooseFiles() {
        const _extname = get_extname(this.fileExtname);
        // 获取后缀
        uniCloud
          .chooseAndUploadFile({
            type: this.fileMediatype,
            compressed: false,
            sizeType: this.sizeType,
            // TODO 如果为空，video 有问题
            extension: _extname.length > 0 ? _extname : undefined,
            count: this.limitLength - this.files.length, //默认9
            onChooseFile: this.chooseFileCallback,
            onUploadProgress: (progressEvent) => {
              this.setProgress(progressEvent, progressEvent.index);
            },
          })
          .then((result) => {
            this.setSuccessAndError(result.tempFiles);
          })
          .catch((err) => {
            console.log('选择失败', err);
          });
      },

      /**
       * 选择文件回调
       * @param {Object} res
       */
      async chooseFileCallback(res) {
        const _extname = get_extname(this.fileExtname);
        const is_one =
          (Number(this.limitLength) === 1 && this.disablePreview && !this.disabled) ||
          this.returnType === 'object';
        // 如果这有一个文件 ，需要清空本地缓存数据
        if (is_one) {
          this.files = [];
        }

        let { filePaths, files } = get_files_and_is_max(res, _extname);
        if (!(_extname && _extname.length > 0)) {
          filePaths = res.tempFilePaths;
          files = res.tempFiles;
        }

        let currentData = [];
        for (let i = 0; i < files.length; i++) {
          if (this.limitLength - this.files.length <= 0) break;
          files[i].uuid = Date.now();
          let filedata = await get_file_data(files[i], this.fileMediatype);
          filedata.progress = 0;
          filedata.status = 'ready';
          this.files.push(filedata);
          currentData.push({
            ...filedata,
            file: files[i],
          });
        }
        this.$emit('select', {
          tempFiles: currentData,
          tempFilePaths: filePaths,
        });
        res.tempFiles = files;
        // 停止自动上传
        if (!this.autoUpload) {
          res.tempFiles = [];
        }
      },

      /**
       * 批传
       * @param {Object} e
       */
      uploadFiles(files) {
        files = [].concat(files);
        return uploadCloudFiles
          .call(this, files, 5, (res) => {
            this.setProgress(res, res.index, true);
          })
          .then((result) => {
            this.setSuccessAndError(result);
            return result;
          })
          .catch((err) => {
            console.log(err);
          });
      },

      /**
       * 成功或失败
       */
      async setSuccessAndError(res, fn) {
        let successData = [];
        let errorData = [];
        let tempFilePath = [];
        let errorTempFilePath = [];
        for (let i = 0; i < res.length; i++) {
          const item = res[i];
          const index = item.uuid ? this.files.findIndex((p) => p.uuid === item.uuid) : item.index;

          if (index === -1 || !this.files) break;
          if (item.errMsg === 'request:fail') {
            this.files[index].url = item.path;
            this.files[index].status = 'error';
            this.files[index].errMsg = item.errMsg;
            // this.files[index].progress = -1
            errorData.push(this.files[index]);
            errorTempFilePath.push(this.files[index].url);
          } else {
            this.files[index].errMsg = '';
            this.files[index].fileID = item.url;
            const reg = /cloud:\/\/([\w.]+\/?)\S*/;
            if (reg.test(item.url)) {
              this.files[index].url = await this.getTempFileURL(item.url);
            } else {
              this.files[index].url = item.url;
            }

            this.files[index].status = 'success';
            this.files[index].progress += 1;
            successData.push(this.files[index]);
            tempFilePath.push(this.files[index].fileID);
          }
        }

        if (successData.length > 0) {
          this.setEmit();
          // 状态改变返回
          this.$emit('success', {
            tempFiles: this.backObject(successData),
            tempFilePaths: tempFilePath,
          });
        }

        if (errorData.length > 0) {
          this.$emit('fail', {
            tempFiles: this.backObject(errorData),
            tempFilePaths: errorTempFilePath,
          });
        }
      },

      /**
       * 获取进度
       * @param {Object} progressEvent
       * @param {Object} index
       * @param {Object} type
       */
      setProgress(progressEvent, index, type) {
        const fileLenth = this.files.length;
        const percentNum = (index / fileLenth) * 100;
        const percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total);
        let idx = index;
        if (!type) {
          idx = this.files.findIndex((p) => p.uuid === progressEvent.tempFile.uuid);
        }
        if (idx === -1 || !this.files[idx]) return;
        // fix by mehaotian 100 就会消失，-1 是为了让进度条消失
        this.files[idx].progress = percentCompleted - 1;
        // 上传中
        this.$emit('progress', {
          index: idx,
          progress: parseInt(percentCompleted),
          tempFile: this.files[idx],
        });
      },

      /**
       * 删除文件
       * @param {Object} index
       */
      delFile(index) {
        this.$emit('delete', {
          tempFile: this.files[index],
          tempFilePath: this.files[index].url,
        });
        this.files.splice(index, 1);
        this.$nextTick(() => {
          this.setEmit();
        });
      },

      /**
       * 获取文件名和后缀
       * @param {Object} name
       */
      getFileExt(name) {
        const last_len = name.lastIndexOf('.');
        const len = name.length;
        return {
          name: name.substring(0, last_len),
          ext: name.substring(last_len + 1, len),
        };
      },

      /**
       * 处理返回事件
       */
      setEmit() {
        let data = [];
        let updateUrl = [];
        if (this.returnType === 'object') {
          data = this.backObject(this.files)[0];
          this.localValue = data ? data : null;
          updateUrl = data ? data.url : '';
        } else {
          data = this.backObject(this.files);
          if (!this.localValue) {
            this.localValue = [];
          }
          this.localValue = [...data];
          if (this.localValue.length > 0) {
            this.localValue.forEach((item) => {
              updateUrl.push(item.url);
            });
          }
        }
        this.$emit('update:modelValue', this.localValue);
        this.$emit('update:url', updateUrl);
      },

      /**
       * 处理返回参数
       * @param {Object} files
       */
      backObject(files) {
        let newFilesData = [];
        files.forEach((v) => {
          newFilesData.push({
            extname: v.extname,
            fileType: v.fileType,
            image: v.image,
            name: v.name,
            path: v.path,
            size: v.size,
            fileID: v.fileID,
            url: v.url,
          });
        });
        return newFilesData;
      },
      async getTempFileURL(fileList) {
        fileList = {
          fileList: [].concat(fileList),
        };
        const urls = await uniCloud.getTempFileURL(fileList);
        return urls.fileList[0].tempFileURL || '';
      },
      /**
       * 获取父元素实例
       */
      getForm(name = 'uniForms') {
        let parent = this.$parent;
        let parentName = parent.$options.name;
        while (parentName !== name) {
          parent = parent.$parent;
          if (!parent) return false;
          parentName = parent.$options.name;
        }
        return parent;
      },
    },
  };
</script>

<style lang="scss" scoped>
  .uni-file-picker {
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    overflow: hidden;
    /* width: 100%; */
    /* #endif */
    /* flex: 1; */
    position: relative;
  }

  .uni-file-picker__header {
    padding-top: 5px;
    padding-bottom: 10px;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    justify-content: space-between;
  }

  .file-title {
    font-size: 14px;
    color: #333;
  }

  .file-count {
    font-size: 14px;
    color: #999;
  }

  .is-add {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    align-items: center;
    justify-content: center;
  }
  .add-icon {
    width: 57rpx;
    height: 49rpx;
  }
  .file-subtitle {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
    width: 140rpx;
    height: 36rpx;
    z-index: 1;
    display: flex;
    justify-content: center;
    color: #fff;
    font-weight: 500;
    background: rgba(#000, 0.3);
    font-size: 24rpx;
  }
</style>
